variable factory overhead cost

例句：

1. 1. The weather is a variablefactor in the outcome of an experiment.
   天气是实验结果的一个可变因素。
2. 2. Thecost of production is a variable that canbe influenced by many factors.
   生产成本是一个可变的因素，可以受到许多因素的影响。
3. 3. Theprice of oil is a variable that fluctuates with global demand.
   油价是一个可变的因素，随着全球需求的变化而波动。